期刊
JOURNAL OF MATERIALS RESEARCH
卷 25, 期 8, 页码 1525-1531出版社
MATERIALS RESEARCH SOC
DOI: 10.1557/JMR.2010.0195
关键词
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资金
- Oak Ridge National Laboratory (ORNL)
- Center for Nanophase Materials Sciences
- Division of Scientific User Facilities, U.S. Department of Energy
- Fluid Interface Reactions, Structures and Transport (FIRST) Center
- U.S. Department of Energy, Office of Science
- Office of Basic Energy Sciences [ERKCC61]
Capacitive energy storage mechanisms in nanoporous carbon supercapacitors hinge on endohedral interactions in carbon materials with macro-, meso-, and micropores that have negative surface curvature. In this article, we show that because of the positive curvature found in zero-dimensional carbon onions or one-dimensional carbon nanotube arrays, exohedral interactions cause the normalized capacitance to increase with decreasing particle size or tube diameter, in sharp contrast to the behavior of nanoporous carbon materials. This finding is in good agreement with the trend of recent experimental data. Our analysis suggests that electrical energy storage can be improved by exploiting the highly curved surfaces of carbon nanotube arrays with diameters on the order of 1 nm.
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